Dip"no*i (?), n. pl. [NL., fr. Gr. with two breathing apertures; = twice + breath.] Zool.
A group of ganoid fishes, including the living genera Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See Ceratodus, and Illustration in Appendix.
© Webster 1913.